蜥蜴中脑神经通路和起源细胞的形态

NEURONAL PATHWAYS AND MORPHOLOGY OF ORIGINATING CELLS IN THE LACERTILIAN MIDBRAIN

本文采用 HRP 法研究了蛤蚧(Gekko gekko)和鳄蜥(Shinisaurus crocodilurus)视顶盖、中脑深核(NPM)与峡核之间的通路和起源细胞的形态。结果指出:1.顶盖与峡核大细胞部(Imc)呈相互区域对应投射;2.同侧顶盖—Imc 投射细胞主要位于第7层,系有径向树突的梨形细胞;同侧 Imc—顶盖投射细胞为小树突域的梨形或多角形细胞;3.顶盖注射标记的 NPM细胞呈纺锤形,染色浅;峡核注射标记的 NPM 细胞,其粗树突往往伸向顶盖;4.NPM 注射标记顶盖细胞和峡核细胞,前者主要位于顶盖第7层,后者散布在峡核大细胞部(Imc)和峡核小细胞部(Ipc)内。

The present paper studies the neuronal pathways connecting the optic tectum(?) the nucleus profundus mesencephali(NPM)and the nucleus isthmi,and the morph- ology of their originating cells in Gekko gekko and Shinisaurus crocodilurus by using horseradish peroxidase(HRP)tracing method.The results indicate that 1. There exist reciprocal topographic projections between the tectum and the nucleus. isthmi pars magnocellularis(Imc);2.The ipsilateral tecto-Imc projection originates from cells mainly located in layer 7,which have piriform somata with radical den- drites;the ipsilateral Imc-tectal projection originates from piriform or polygonal neurons with a small dendritic field;3.Cells labeled in NPM following tectal injec tions are fusiform in shape,paler in color,whereas NPM cells labeled following isthmic injections are numerous,whose thick dendrites often go up to the tectum(?) 4.NPM injections label both tectal and isthmic cells.The former are mainly loca- ted within layer 7,while the latter are in Imc and Ipc.